261368019031 has 16 divisors (see below), whose sum is σ = 301213753344. Its totient is φ = 222156969984.

The previous prime is 261368018963. The next prime is 261368019037. The reversal of 261368019031 is 130910863162.

It is a cyclic number.

It is not a de Polignac number, because 261368019031 - 2¹⁵ = 261367986263 is a prime.

It is a super-2 number, since 2×261368019031² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261368019037) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75426 + ... + 726928.

It is an arithmetic number, because the mean of its divisors is an integer number (18825859584).

Almost surely, 2^261368019031 is an apocalyptic number.

261368019031 is a deficient number, since it is larger than the sum of its proper divisors (39845734313).

261368019031 is a wasteful number, since it uses less digits than its factorization.

261368019031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651990.

The product of its (nonzero) digits is 46656, while the sum is 40.

The spelling of 261368019031 in words is "two hundred sixty-one billion, three hundred sixty-eight million, nineteen thousand, thirty-one".